A portable dry chemical fire extinguisher discharges by __________.
• How portable dry chemical extinguishers are pressurized and stored • Difference between stored-pressure vs. cartridge-operated extinguishers • What actually forces the powder out of the extinguisher cylinder
• Think about what must happen inside the extinguisher to push the dry chemical powder up the hose and out the nozzle. • Which options describe a reliable, controllable source of pressure that can be built into a small, portable unit? • Eliminate any options that would not create enough or consistent pressure to throw powder toward a fire.
• Ask yourself: is dry chemical powder likely to flow by gravity alone, especially through a hose and nozzle? • Consider whether a hand pump is common on standard portable dry chemical extinguishers you see on board vessels and in buildings. • Think about whether mixing water with the chemical is how dry chemical units are designed, or if that sounds more like a different type of extinguisher.
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